Means for baking powder to plates to be etched



June 12, 1923.

' w. J. LOGAN MEANS FOR- BAKING POWDER TO PLATES TO BE ETCHED Filed July 6, 1920 I gwue'ntoz I W J Lo 911,11,

Patented June 12, 1923.

UNITE res WILLIAlI J. LOGAN, OF CLEVELAND, OHIO.

MEANS FOR BAKING POWDER T0 PLATES TO BE IEIGI-IED.

Application filed July 6,

To all whom it may concern:

Be it known, that I, TYVILLIAM J. LoeAN, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Means for Baking Powder to Plates to Be Etched, of which the following is a specification.

This invention relates to means carbonizing enamel prints on copper, and for sinjiilar purposes, for baking powder to plates to be etched, and has for its principal object to provide a machine of sin'iple, compact and inexpensive construction, which, is easy to manipulate, quick in action, efficientfand economical in operation. 1

In order that th invention may be clearly understood, the same will be hereinafter fully described in connection with the accom panying drawings illustrating the invention, and the novel features thereof willbe distinctly pointed out in the. appended claims.

In the drawings, similar characters of reference are used to designate corresponding parts.

Figure 1 is a front elevation of a machine constructed in accordance with my invention,

Fig. 2 is a side elevation of same, parts being broken away to better show the construction,

Fig. 3 is a plan view of the top portion of the machine, and v Fig. 4t illustrates the electric circuit.

Referring to the drawings, the frame of the machine consists of an upper rectangular section formed of front and rear plates 12 and side plates 34, and a similar lower sec tion indicated by 5, which sections are sup ported at their corners by legs 6. The top of the machine for supporting a plate as 7 to which powder is to be baked, is formed of twisted square bars 8 arranged horizontally in spaced relation and having their ends fixed in the front and rear plates 1-2 of the upper rectangular section of the frame. After the plat 7 has been powdered upon its upper side by hand in the usual manner, it is laid, powdered side up, upon the twisted square bars 8, for the purpose of being heated from below by a gas flame to bake the powder thereto. Elongated burners 9 are arranged below and between the twisted bars 8, and these burners are supported upon transverse bars 10 carried by the side plates 3 and 4 of the upper section of the frame, and extend 1920. Serial No. 394,223.

which is connected with a gas supply line as 16, and between the pipes 15 and 16 is a suitable spring actuated shut-off valve 17 having an operating lever 18. For pushing upwardly upon the lever 18 to open the shutoff valve 17 against the action of its closing spring to admit gas to the burners 9, a foot pedal 19 is pivoted at 20 to a bracket 21 depending from the lower section 5 of the frame, and its long over-weighted end 22 is connected to said operating lever by a push rod 23. By pressing upon the foot pedal 19, the shutoff valve 17 will be opened to admit gas to the burners 9. In order to light the burners, the terminal 24 of a high frequency coil 25 is placed adjacent one of the burners, and a suitable switch at 26 is adapted to turn on or off the electric current from any suitablle source of supply to saidhigh frequency 001 When the powder has been leaked to the plate 7, it is necessary that the plate be cooled before it can be brushed and another coating of powder applied thereupon. To cool the plate quickly, air is blown up against the underside thereof and down upon its powdered upper side, by. means of a fan 27 supported by the lower section5 of the frame,from which fan extends a. conduct 28 having an upwardly turned lower branch 29 and a downwardly turned upper branch 30 for directing air against the under side and upper side respectively of said plate. The fan 27 is directly driven by an electric motor 31, and this motor is connected in the same circuit with the high frequency coil 25. A suitable switch at 32 is adapted to start and stop said motor for producing or cutting off the cooling air.

In practice, the plate to be heated for any purpose such as baking powder thereon, or carbonizing enamel prints thereon, is laid upon the twisted bars 8, the operator presses upon the foot pedal 19 and holds it down to admit the gas to the burners 9, and at the same time he throws the switch 26 to turn on the current for producing a. spark at 24 to ignite the gas. .After the gas is ignited, the switch is thrown to cut off the spark at 241. When the gas has been turned on sufiiciently long to heat the plate as desired, the operator releases the foot pedal 19, thereby permitting the shut-off valve 17 to close and thus cut off the gas to the burners 9. then operates the switch 32 to start the motor 31, which drives the fan 27, thereby forcing air through the branches '29 and 30 against the lower side of the'plate 7 and upon the powdered upper side thereof respectively. When the plate has been cooled sufiiciently, the switch 32 is operated to stop the motor, and the cooling air is thus cut off from the plate. As it is necessary to bake several coats of powder to plates to be etched, the alternate baking and cooling as accomplished by this invention is a great advantage.

Having fully described my invention, what I claim is:

1. In a means for baking powder and the like to plates, the combination of means for heating the underside of a plate, and means for cooling the underside of the plate after the means for heating the plate has been shut off, substantially as described.

2. In a means for baking powder and the like to plates, the combination of means for heating a plate, means for shutting off the means for heating the plate, and means for directing air to opposite sides of the plate for cooling it after said heating means has been shut off, substantially as described.

3. Ina means for baking powder and the like to plates, the combination of a support for the plate, burners below the plate, means for admitting gas to and shutting oil gas from the burners, and means "for directing air against the underside of said plate after the gas has been shut off from the burners for cooling the plate, substantially as described.

4. In a means for baking powder and the like to plates, the combination of a support for the plate, burners below the plate, means for admitting gas to and shutting ofi' gas from the burners, and means for directing air against the underside and the upper side of said plate after the gas has been shut ofi from the burner for cooling the plate, substantially as described.

5. In ameans for baking powder and the like to plates, the combination of a support for the plate, burners below the plate, means for admitting gas to and shutting off gas from the burners, a fan, a conduct from the fan, and branches from the conduct to the under side and the upper side of said plate for directing air thereagainst to cool the plate after the gas has been shut off from the burners, substantially as described.

6. In a means for baking powder and the like to plates, the combination of a support for the plate, burners below the plate, a spring actuated valve for shutting off gas to the burners, a lever for operating the valve, a foot pedal, a rod connecting the foot pedal to the valve lever whereby pressure upon the foot pedal will open said valve, and means for directing air against the underside of said plate for cooling it after releasing the foot pedal, to permit said valve to shut off the gas to the burners, substantially as described.

7. In a means for baking powder and the like to plates, the combination of a support for the plate, burners below the plate, means WILLIAM J. LOGAN. I 

